Google is your friend. Look at RFC 2821 and RFC 2822, which are the standards for emails. If there is no mention of your desired feature in these documents, what you want to do almost certainly cannot be done from the mainframe directly.

The way to ensure security on email is to encrypt the message (using any of the various methods available), then email it as an attachment to a message.

Password protection of a zip file doesn't add much security -- as shown by Googling "zip password recovery" and finding there's 11 million hits. If the o/p requirement comes from PCI or something similar, zip passwords do not meet the requirement.

Password protection of a zip file doesn't add much security -- as shown by Googling "zip password recovery" and finding there's 11 million hits. If the o/p requirement comes from PCI or something similar, zip passwords do not meet the requirement.

Why is that Enrico? A lot of stuff is to be found about en/decryption on the internets and/or literature.
Asking for some solutions/procedures etc. is not that bad.
Implementing some things is another story, that would be left to
authorized people. But maybe the TS belongs to that.